Bending and forming machine



C. G. CRONWALL BENDING AND FORMING MACHINE July 23, 1929.

Filegi Jan. 3, 1928 fst-snted July 23, 1929.

STATE P5,: qwai hi8 earner caries.

CARL G. CRONWALL, 01' CHICAGD, ELLINOTS.

BENDING AND EQB MING MACHINE.

Application filed January s, 1928. Serial No. 244,178.

Another important object of the invention is its flexibility of use. It is adapted to be used in connection with such machines as punch presses, shearing machines, bending machines and the like, and provides a means for completing such operations both ciently and quickly.

Another and still further important objcct of the invention is the provision of means for adjusting the space between the jaws or dies of such machines to allow the admission between the jaws of work of different thicknesses. Incidentally, this adjustable gap arrangement permits of readily changing and adjusting the dies used there with.

A still further object of the invention is the provision of a simple and rugged device,

' easily constructed and hence cheaply manufactored.

Other and further important objects of the invention will be apparent from the dis closures in the accompanying drawing and following specification.

The invention in a preferred form is illustrated in the drawings and hereinafter more fully described.

In the drawings:

Figure 1 is a side elevation of-the device, partly in section, illustrating the compression mechanism train in assembled position.

Figure 2 is a front elevation of the same.

Figure 3 is a detail perspective, illustrating the compound eccentric lever.v

Figure 4 is a fragmentary sectional view, showing the vertical slidable compression element.

Figure 5 is a sectional view of the die retaming means.- i

As shown in the drawings: 7 i

The reference numeral 10 indicates thebody portion of the device, which is preferably mounted on a supporting foundation 12 by means of the angle irons l4, and the retaining belts or rivets 16.

Integral with the body 10 are two hollow guide portions 18 and 20 rectangular in cross section. The upper guide 18 has a cover 23 through which an adjusting screw 24 acts,

rotated by a handle 26. The lower. end of this screw is rotatably connected to a die support 28 by means of a socket connection 30. This die support 28 may accordingly be raised or lowered at will, increasing or decreasing the operating gap 32 between the dies. At the lower end of'the member 28an aperture 3 1 is provided, as shown best in Figure 2, lnto which a the 36 may be inserted. The die is held rigidly in position by means of a locking-screw 38.

, Slidably positioned in the lower guide 20 is another die support 10, the upper portion of which is constructed to receive a die L2, said die being mounted on this member by means of pins 4C4, as shown in detail in Figure 5.

Mounted in the lower end of the die support 40 is a link 46, best shown in Figure The upper, end of the link 46 is adapted for a slightslidable movement in its socket in member 40, being provided with a slot 5i in which a retaining pin l9 acts. This arrangement allows for wear at the bearing surface 53. i

The other end of the link 46 is pivotally connected to a co-operating cam link 48 at the bifurcated pivot point 50. Pivotally connected also to the lower portion of link 48, and with a bifurcated'pivot point52,

eccentrically positioned with respect to the a pivot point 50, are two links 54, as shown in Figures 1 and 2. The upper ends of these lmks are connected pivotallyto the outer face of the guide member 20, at the points 55. g

The upper end of the cam-link 18 is pivotally connected to a lever arm 56 by a bifurcated pivot point 58, this being located sub stantially above the lower end of the lever arm. Pivotally connected at 60 to the lowermost end of'the arm 56 is connecting rod 62 which has its upper end pivotally connected to the guide 20. o

It can be readily observed that from this lever arrangement the member 40 has only one degree of freedom, namely, an up and down motion in a vertical line. On pulling the lever arm 56 forwardly and downwardly, the upper end of the link 48 is given a similar downward and outward motion, the outward motion being taken up by the link 54, hence only one motion remains to the point 50, namely an upward motion along a vertical line, the longitudinal axis of the guide members 18 and 20. The lever. arm is offset as shown at 57 to allow of a with respect to the body 10.

The pin 64,- acting in the slot 66 merely restrains the downward motion of the compression member 40, in turn maintaining the lever rm 56 in a substantially upright position when the jaws '36 and 42 are open, and overthrow of the handle positively is prevented. The lower part of the slot 66 never comes in contact with the pin 64s as the upward motion of the compression member isgoverned by the distance between the centers of the pivot points and 52, which is a shorter distance than the distance between the cente s of curvature of the upper and lower portions of the slot 66. Thus the pin 6d is in no danger of being sheared.

It will be apparent from the above disclosure that herein is provided a lever arrangement which may be used in combination with various types of machines requiring compressive force .t'or shearing, bending, etc.,.a mechan'sm which acts quickly, conveniently and with great force, a mechanism which is or" proper action comparatively simple construction and at the same time is strong and rugged.

I am aware that many changes may be made and numerous details o'l construction varied throughout a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon otherwise than as necessitated by the prior art.

I claim. as my invention: I

1. In a'machine using compressive force, a body, a plurality of guides on the body, a plurality of compression members slidably positioned in the guides, and means for im-. parting vertical motion to the lower compression member, said means comprising-a system of compound levers, one oi? levers having a rounded end which makes sliding contact with the lower end oi the said compression member.

2. In a machine using compres" 'e force, a body, a plurality oi" hollow guides integral 'ith the body, each o1 said guides being rectangular in cl'oss-sectiom-a plurality ot compression members slidably positioned in the guides, and means for impartinga vertical motion to the lower compression member, said means comprising a system of compound levers, one ofsaid levers having a rounded '.end in the form of an are 0 5 a circle which makes contact with the lower end of the said compression member, and additional means.

- pinned in a socket in the lower compression l; shaped, pivotally connected to the lever.

arm substantially above its end, a third link pivotally connected to the other end of the L shaped second link, said third link having its other end slidably mounted in a compression member, a fourth link pivotally connected to the second link and having its point of connection eccen'trically placed with respect to the pivotal connection between the third link the L shaped link, the other end of the fourth link being pivotally connected. to the outside'ot the guide. I

4. A machine using compressive force, 7 comprising a body, a plurality of guides 1ntegral with the body, a plurality of compres sion members slidably positioned in the guides, a system of compound eccentric levers for producing the compressive force, said system including an operating lever arm, and means for maintaining the-lever arm in; a substantially vertical position when thecompression members aredisengaged, said means including a pin rigidly iii-led in one guide and a slot in the corresponding compression memher in which the pin .acts.

5. In a; machine using. compressive force, a-

body, a plurality of hollow guidesintegral with the body, each of said guides being rectangular in cross-section, a plurality of com aression members slidabl'y positioned. in the guides, and means for imparting a vertical motion to the lower compression member, said means comprising a system of compound levers, one ot levers having a rounded end in the form of an arc of a circle which makes contact with the lower end oi the said compression member, and additional means for restraining lateral motion of the said rounded end lever, said additional means including a link pivotally connected to the rounded end link at one end and slidably' pinned in a socket in the lowercompression member, said pivotal connection including a pin at the center of curvature of the rounded end of the lever.

In testimony whereof I aliix my signature.

carer. e. ORONWALL. 

